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Rajh T, Masson E, Latt KZ, Smith A, Brugh AM, Dandu N, Trainer D, Curtiss LA, Ngo AT, Hla SW. Light- and Chemical-Doping-Induced Magnetic Behavior of Eu Molecular Systems. Inorg Chem 2023; 62:12721-12729. [PMID: 37506323 DOI: 10.1021/acs.inorgchem.3c01154] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2023]
Abstract
Variable temperature electron paramagnetic resonance (VT-EPR) was used to investigate the role of the environment and oxidation states of several coordinated Eu compounds. We find that while Eu(III) chelating complexes are diamagnetic, simple chemical reduction results in the formation of paramagnetic species. In agreement with the distorted D3h symmetry of Eu molecular complexes investigated in this study, the EPR spectrum of reduced complexes showed axially symmetric signals (g⊥ = 2.001 and g∥ = 1.994) that were successfully simulated with two Eu isotopes with nuclear spin 5/2 (151Eu and 153Eu with 48% and 52% natural abundance, respectively) and nuclear g-factors 151Eu/153Eu = 2.27. Illumination of water-soluble complex Eu(dipic)3 at 4 K led to the ligand-to-metal charge transfer (LMCT) that resulted in the formation of Eu(II) in a rhombic environment (gx = 2.006, gy = 1.995, gz = 1.988). The existence of LMCT affects the luminescence of Eu(dipic)3, and pre-reduction of the complex to Eu(II)(dipic)3 reversibly reduces red luminescence with the appearance of a weak CT blue luminescence. Furthermore, encapsulation of a large portion of the dipic ligand with Cucurbit[7]uril, a pumpkin-shaped macrocycle, inhibited ligand-to-metal charge transfer, preventing the formation of Eu(II) upon illumination.
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Affiliation(s)
- Tijana Rajh
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, Illinois 60540, United States
- School of Molecular Sciences, Arizona State University, 551 E University Dr, Tempe, Arizona 85281, United States
| | - Eric Masson
- Department of Chemistry, Ohio University, Athens, Ohio 45701, United States
| | - Kyaw Zin Latt
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, Illinois 60540, United States
| | - Ashton Smith
- Department of Chemistry, Ohio University, Athens, Ohio 45701, United States
| | - Alexander M Brugh
- School of Molecular Sciences, Arizona State University, 551 E University Dr, Tempe, Arizona 85281, United States
| | - Naveen Dandu
- Department of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60608, United States
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Daniel Trainer
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, Illinois 60540, United States
| | - Larry A Curtiss
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Anh T Ngo
- Department of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60608, United States
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Saw-Wai Hla
- Nanoscience and Technology Division, Argonne National Laboratory, 9700 S Cass Ave, Argonne, Illinois 60540, United States
- Nanoscale & Quantum Phenomena Institute, and Department of Physics & Astronomy, Ohio University, Athens, Ohio 45701, United States
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2
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Luo Z, Ren H, Mousa JJ, Rangel DEN, Zhang Y, Bruner SD, Keyhani NO. The PacC transcription factor regulates secondary metabolite production and stress response, but has only minor effects on virulence in the insect pathogenic fungus Beauveria bassiana. Environ Microbiol 2017; 19:788-802. [PMID: 28083986 DOI: 10.1111/1462-2920.13648] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2016] [Revised: 11/15/2016] [Accepted: 12/15/2016] [Indexed: 11/29/2022]
Abstract
The PacC transcription factor is an important component of the fungal ambient pH-responsive regulatory system. Loss of pacC in the insect pathogenic fungus Beauveria bassiana resulted in an alkaline pH-dependent decrease in growth and pH-dependent increased susceptibility to osmotic (salt, sorbitol) stress and SDS. Extreme susceptibility to Congo Red was noted irrespective of pH, and ΔBbpacC conidia showed subtle increases in UV susceptibility. The ΔBbPacC mutant showed a reduced ability to acidify media during growth due to failure to produce oxalic acid. The ΔBbPacC mutant also did not produce the insecticidal compound dipicolinic acid, however, production of a yellow-colored compound was noted. The compound, named bassianolone B, was purified and its structure determined. Despite defects in growth, stress resistance, and oxalate/insecticidal compound production, only a small decrease in virulence was seen for the ΔBbpacC strain in topical insect bioassays using larvae from the greater waxmoth, Galleria mellonella or adults of the beetle, Tenebrio molitor. However, slightly more pronounced decreases were seen in virulence via intrahemcoel injection assays (G. mellonella) and in assays using T. molitor larvae. These data suggest important roles for BbpacC in mediating growth at alkaline pH, regulating secondary metabolite production, and in targeting specific insect stages.
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Affiliation(s)
- Zhibing Luo
- Biotechnology Research Center, Southwest University, Chongqing, 400716, P. R. China.,Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, 32611, USA
| | - Hui Ren
- Biotechnology Research Center, Southwest University, Chongqing, 400716, P. R. China
| | - Jarrod J Mousa
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Drauzio E N Rangel
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia, GO, 746050-50, Brazil
| | - Yongjun Zhang
- Biotechnology Research Center, Southwest University, Chongqing, 400716, P. R. China
| | - Steven D Bruner
- Department of Chemistry, University of Florida, Gainesville, FL, 32611, USA
| | - Nemat O Keyhani
- Department of Microbiology and Cell Science, University of Florida, Gainesville, Florida, 32611, USA.,Genetic Engineering Research Center School of Life Sciences, Chongqing University, Chongqing, 400045, P.R. China
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Natarajan P, Chaudhary R, Venugopalan P. Silver(I)-Promoted ipso-Nitration of Carboxylic Acids by Nitronium Tetrafluoroborate. J Org Chem 2015; 80:10498-504. [DOI: 10.1021/acs.joc.5b02133] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Palani Natarajan
- Department of Chemistry & Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh 160 014, India
| | - Renu Chaudhary
- Department of Chemistry & Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh 160 014, India
| | - Paloth Venugopalan
- Department of Chemistry & Centre for Advanced Studies in Chemistry, Panjab University, Chandigarh 160 014, India
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Zhou S, Doni E, Anderson GM, Kane RG, MacDougall SW, Ironmonger VM, Tuttle T, Murphy JA. Identifying the Roles of Amino Acids, Alcohols and 1,2-Diamines as Mediators in Coupling of Haloarenes to Arenes. J Am Chem Soc 2014; 136:17818-26. [DOI: 10.1021/ja5101036] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Shengze Zhou
- WestCHEM,
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Eswararao Doni
- WestCHEM,
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Greg M. Anderson
- WestCHEM,
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Ryan G. Kane
- WestCHEM,
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Scott W. MacDougall
- WestCHEM,
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - Victoria M. Ironmonger
- GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage SG1 2NY, United Kingdom
| | - Tell Tuttle
- WestCHEM,
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
| | - John A. Murphy
- WestCHEM,
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, United Kingdom
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